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VDPipeline senses its VideoDecoder cannot produce compositor renderable
output format by asking VD to call its PickDecoderOutputFormat().
When it is called, VDPipeline instantiates an ImageProcessor to see if
it can convert any VD's supported output format to a renderable format.

VDPipeline defines a PickFormatCB for VD to ask VDPipeline which output
format shall be used. The callback is assigned to VDPipeline supported
VD via its constructor. Currently V4L2SliceVideoDecoder is modified.

For ImageProcessorFactory, it adds a CreateWithInputCandidates() factory
method that instantiate an ImageProcessor to see if it can convert
any of VD's supported output formats to a valid renderable format.
The knowledge of which format is renderable is provided by
VDPipeline::PickRenderableFormat(), which is currently implemented by
hardcoding known renderable formats.

Bug: 1004727
Test: pass vda_tests --use_vd --gtest_filter=-*Reset* on Kukui,
      remaining failure might cause by crbug.com/1023703
Test: pass VD test on Kevin and Eve, which uses V4L2SVD and VaapiVD

Change-Id: I2aaf6a6fad347fe1b43a30e56a8f1a9ced84f1d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911068Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721802}